{"data":{"schemaVersion":"realm.temporal-relationships.v1","temporalSemantics":{"validTime":{"granularity":"date","bounds":"inclusive","nullStart":"start date not published in the upstream history row","nullEnd":"open-ended in the upstream history row; not independent proof of present control"},"transactionTime":{"observedAt":"2026-10-17T05:35:58.500035+00:00","meaning":"time the checksum-addressed MDRS artifacts were observed by the PostgreSQL ingestion"},"derivation":{"controllerControlsOperator":"intersection of controller and operator valid-time intervals evidenced through this mine","currentIdentity":"current controller and operator are asserted only by the MDRS Mines snapshot"}},"current":{"mine":{"type":"mine","id":"1519438","name":"Mine #17"},"operator":{"type":"operator","id":"P23622","name":"Blair Coal Co Inc."},"controller":{"type":"controller","id":"C15524","name":"Ricky  Blair"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-17T05:35:58.500035+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"C15524","name":"Ricky  Blair"},"object":{"type":"mine","id":"1519438","name":"Mine #17"},"validFrom":"1997-01-28","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1519438|C15524|1997-01-28|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0077353","name":"Shelly B  Mullins et al"},"object":{"type":"mine","id":"1519438","name":"Mine #17"},"validFrom":"2008-07-14","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1519438|0077353|2008-07-14|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0092165","name":"Appalachian Contractors Inc"},"object":{"type":"mine","id":"1519438","name":"Mine #17"},"validFrom":"2009-10-28","validTo":"2011-05-02","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1519438|0092165|2009-10-28|2011-05-02"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0077353","name":"Shelly B  Mullins et al"},"object":{"type":"operator","id":"0092165","name":"Appalachian Contractors Inc"},"validFrom":"2009-10-28","validTo":"2011-05-02","current":false,"derived":true,"evidenceMineId":"1519438","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1519438|0092165|2009-10-28|0077353|2008-07-14|12127"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P23622","name":"Blair Coal Co Inc."},"object":{"type":"mine","id":"1519438","name":"Mine #17"},"validFrom":"2011-05-03","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1519438|P23622|2011-05-03|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C15524","name":"Ricky  Blair"},"object":{"type":"operator","id":"P23622","name":"Blair Coal Co Inc."},"validFrom":"2011-05-03","validTo":null,"current":true,"derived":true,"evidenceMineId":"1519438","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1519438|P23622|2011-05-03|C15524|1997-01-28|95848"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1519438","dataSource":"postgres","snapshotId":"2026-10-17T05:35:58.500035+00:00","completedAt":"2026-10-17T06:17:15.228Z","sourceCount":20,"totalRows":15450873,"relationshipSemantics":"valid time; null validTo means current or open-ended in the source"}}